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ASGI app misses coverage lines after awaiting async sqlalchemy code #1082

daviskirk opened this issue Dec 28, 2020 · 17 comments

ASGI app misses coverage lines after awaiting async sqlalchemy code #1082

daviskirk opened this issue Dec 28, 2020 · 17 comments
bug Something isn't working concurrency fixed


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Describe the bug

This may be a very specialized problem, but since it concerns very widely used libraries I thought it would be helpful to report:

Within an ASGI app (the example uses starlette here), using the new async/await engine in sqlalchemy results in any lines AFTER usage of the database engine not being recognized in coverage.

To Reproduce

How can we reproduce the problem? Please be specific. Don't just link to a failing CI job. Answer the questions below:

What version of Python are you using?:

3.8.5 (virtual environment using conda)

What version of are you using? The output of coverage debug sys is helpful.

-- sys -------------------------------------------------------
                        version: 5.3
                       coverage: /home/user/env/lib/python3.8/site-packages/coverage/
                         tracer: -none-
                        CTracer: available
           plugins.file_tracers: -none-
            plugins.configurers: -none-
      plugins.context_switchers: -none-
              configs_attempted: .coveragerc
                   configs_read: /home/backend/pyproject.toml
                    config_file: /home/backend/pyproject.toml
                config_contents: b'[]\nshow_missing = true\n'
                      data_file: -none-
                         python: 3.8.5 (default, Sep  4 2020, 07:30:14) [GCC 7.3.0]
                       platform: Linux-5.4.0-56-generic-x86_64-with-glibc2.10
                 implementation: CPython
                     executable: /home/user/env/bin/python
                   def_encoding: utf-8
                    fs_encoding: utf-8
                            pid: 2488889
                            cwd: /home/user/backend
                           path: /home/user/env/bin
                    environment: CONDA_PYTHON_EXE = /home/user/anaconda/bin/python
                   command_line: /home/user/env/bin/coverage debug sys
                sqlite3_version: 2.6.0
         sqlite3_sqlite_version: 3.33.0
             sqlite3_temp_store: 0
        sqlite3_compile_options: COMPILER=gcc-7.3.0

What versions of what packages do you have installed? The output of pip freeze is helpful.


What code are you running? Give us a specific commit of a specific repo that we can check out.

Given the packages above, the code should run "as is":

What commands did you run?

Expected behavior

I expect all lines to be covered, since all lines were run (acording to the output (see the printed result) and setting breakpoints).

Instead, the lines following the database operations are skipped:


Additional context

  • Note that the sqlalchemy version is in beta, but since it is very widely used I expect this to be a problem for many people.
  • Sqlalchemy uses the "greenlets" library to pass through context. I can guess that this might have something to do with the missing coverage? However, normal applications (mine included) using starlette or fastapi (or most of the other asgi frameworks), can't switch to the --coverage "greenlet" version since all wsgi endpoints run in a thread (and then none of those are covered).
  • I have no problem concluding that this isn't coverages problem ;), if that is indeed the case. But I wanted to document it for anyone else running into the issue (or perhaps a solution if one does exist).
@daviskirk daviskirk added the bug Something isn't working label Dec 28, 2020
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SQLAlchemy 1.4 uses greenlets and FastAPI uses threads when using synchronous routes.
The problem is that we can't mix concurrency models in coverage as stated in #1012
@daviskirk I avoided the problem by going full blow async (to prevent using threads at all) which is the best option in my opinion.

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Yes, that is a possibility, but there will be many applications that cannot go full async because they depend on sync code.
For example, anything that uses celery. #1012 is indeed the correct issue, I fear that sqlachemy will trigger this problem for many more projects than previous projects that use greenlets because of it's reach and scope.
In any case, if the scope itself isn't enough to have this issue around for people to find that are transitioning to async sqlalchemy I'm find with closing this as #1012 is the actual problem.

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Kludex commented Apr 29, 2021

@daviskirk I've tested with your snippet, and if I add the flag --concurrency=gevent I do get 100% coverage.

EDIT: Works with greenlet as well.

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daviskirk commented Apr 29, 2021

@daviskirk I've tested with your snippet, and if I add the flag --concurrency=gevent I do get 100% coverage.

@Kludex Sorry, the snippet only showed the async route to make clear that it wasn't covered by the default concurrency model.
I updated the snippet to show the problem more clearly (added default, gevent and greenlet).

As #1082 (comment) mentions going full async or full thread is an option, but mixing is not possible any more which I guess might just be how it is (it might not be feasible to really fix this), but I do know that starlette and fastapi advertise the "mixing" of concurrency models a lot which might be problematic.

@daviskirk daviskirk reopened this Apr 29, 2021
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Kludex commented Apr 29, 2021

@daviskirk I see. Thank you for the clarification!

I guess if there's a mix, maybe appending the coverage reports will be the way to go. 🤔

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I'm also testing against a FastAPI project with a mix of async routes, async SQLAlchemy and synchronous FastAPI dependencies. Instructing coverage to use concurrency = gevent works in async routes that use SQLAlchemy but breaks coverage elsewhere in places like the FastAPI dependencies.

Adding a voodoo await asyncio.sleep(0) right after the last line that coverage picks up on (so right after the line that awaits on a SQLAlchemy coroutine) lets coverage get back up to speed and correctly detect coverage on the following lines.

sperrygrove pushed a commit to binkhq/polaris that referenced this issue Nov 12, 2021
sperrygrove pushed a commit to binkhq/polaris that referenced this issue Nov 12, 2021
sperrygrove pushed a commit to binkhq/polaris that referenced this issue Nov 12, 2021
See nedbat/coveragepy#1012
& nedbat/coveragepy#1082

This bug in coverage results in an incorrect coverage
score by erroneously reporting lines of code as missing
from coverage. This commit artificially raised the coverage
over the threshold by having coverage ignore one of the parts
that it missed (which IS covered by unit tests).
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nedbat commented Nov 21, 2021

Thanks for this example. If I pin starlette==0.13.6, I get the same results you did. I'm re-opening this issue, because I don't yet understand how #1012 relates, since you aren't trying to use multiple concurrency settings here.

I also don't understand why you have Route('/run2', run), don't you want to route /run2 to the run2 function?

Sorry if I'm not understanding parts of this.

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Kludex commented Nov 22, 2021

@nedbat I think it was a typo. I've fixed the snippet here:

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nedbat commented Nov 22, 2021

OK, thanks. I made a few more fixes to the example:

diff --git a/ b/
index be18d4c..7d9ef71 100644
--- a/
+++ b/
@@ -20,7 +20,7 @@ async def run(*args, **kwargs):
     return JSONResponse(records)
 def run2(*args, **kwargs):
-    print('start')
+    print('start2')
     with engine2.begin() as conn:
         result = conn.execute(sa.text("select 1"))
         records = dict(result.mappings().first())
diff --git a/ b/
index 2561747..30587f3 100755
--- a/
+++ b/
@@ -1,6 +1,6 @@
 docker-compose up -d
-echo "runing with default concurrency"
+echo "running with default concurrency"
 coverage run
 coverage report -m
 coverage html
@@ -11,6 +11,6 @@ coverage report -m
 coverage html -d htmlcov_greenlet
 echo "running with gevent"
-coverage run --concurrency greenlet
+coverage run --concurrency gevent
 coverage report -m
-coverage html -d htmlcov_greenlet
+coverage html -d htmlcov_gevent

Can you help me out with what I am seeing here? I get this result:

coverage-issue-1082_postgres_1 is up-to-date
running with default concurrency
{'?column?': 1}
{'?column?': 1}
Name     Stmts   Miss  Cover   Missing
--------------------------------------      29      3    90%   17-20
TOTAL       29      3    90%
Wrote HTML report to htmlcov/index.html
running with greenlet
{'?column?': 1}
{'?column?': 1}
Name     Stmts   Miss  Cover   Missing
--------------------------------------      29      6    79%   23-29
TOTAL       29      6    79%
Wrote HTML report to htmlcov_greenlet/index.html
running with gevent
{'?column?': 1}
{'?column?': 1}
Name     Stmts   Miss  Cover   Missing
--------------------------------------      29      6    79%   23-29
TOTAL       29      6    79%
Wrote HTML report to htmlcov_gevent/index.html

What should the result be? What exactly is the bug here? I'm not saying there's no bug, I'm saying I'm a concurrency newb that needs it explained.

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Kludex commented Nov 22, 2021

Can you help me out with what I am seeing here? I get this result:

Sure! :)

Let's start with the first one:

running with default concurrency
{'?column?': 1}
{'?column?': 1}
Name     Stmts   Miss  Cover   Missing
--------------------------------------      29      3    90%   17-20
TOTAL       29      3    90%
Wrote HTML report to htmlcov/index.html

What we see here is the function run() being called, but on line 16, we have that SQLAlchemy makes use of greenlet, and after using it, the lines 17-20 are executed, but the coverage is not able to compute them.

As for the other two:

running with greenlet
{'?column?': 1}
{'?column?': 1}
Name     Stmts   Miss  Cover   Missing
--------------------------------------      29      6    79%   23-29
TOTAL       29      6    79%
Wrote HTML report to htmlcov_greenlet/index.html
running with gevent
{'?column?': 1}
{'?column?': 1}
Name     Stmts   Miss  Cover   Missing
--------------------------------------      29      6    79%   23-29
TOTAL       29      6    79%
Wrote HTML report to htmlcov_gevent/index.html

They are just meant to show that using those concurrency options, we are able to cover the missing lines from before. But then we are not able to have a full coverage anyway - because non async functions will not be covered.

Just to give you more context about the situation here: when developing with Starlette (or FastAPI, fwiw) non-async endpoint functions are executed in a ThreadPoolExecutor (the reason why the last 2 reports don't have full coverage, I guess). If you're interested, you can check the code where this is implemented here.

Let me know if something is not clear, I'd be happy to clarify.

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Kludex commented Nov 22, 2021

Not sure if I was clear, but what is expected: have a way to have 100% coverage on the snippet using a single report command.

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nedbat commented Nov 22, 2021

Thanks. The concurrency setting in is used to know where to look to decide that a new stack is being used. I can see how to accommodate threads and one of the "light threads" packages (greenlet, eventlet, gevent). Do we also need to deal with more than one of the light thread packages at the same time?

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Kludex commented Nov 22, 2021

For this issue, I think it will be enough threads and one "light threads" packages, as you said, but I don't know about other use-cases. 😞

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nedbat commented Nov 25, 2021

Now you can specify --concurrency=thread,gevent (or whatever) as of commit c9d821d. This fixes this problem.

@nedbat nedbat closed this as completed Nov 25, 2021
@nedbat nedbat added fixed and removed next labels Nov 25, 2021
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Kludex commented Nov 25, 2021

Thanks @nedbat ! :)

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nedbat commented Nov 27, 2021

This is now released as part of coverage 6.2.

br3ndonland added a commit to br3ndonland/inboard that referenced this issue Dec 31, 2021

pyproject.toml had an unnecessary `--concurrency=multiprocessing` config
setting, which had been added in 2effdb0 to avoid "very wrong results,"
as worded in the docs. Tests do use the multiprocessing
package, but don't actually start multiple processes, so the setting is
not needed.

After updating to 6.2, reports incorrectly showed FastAPI
and Starlette TestClient route code as uncovered, when it actually was.
Removing the concurrency setting from pyproject.toml resolves the issue.
pozsa added a commit to pozsa/alphafold-on-fire that referenced this issue Jan 26, 2022
pozsa added a commit to pozsa/alphafold-on-fire that referenced this issue Jan 27, 2022
pozsa added a commit to paulscherrerinstitute/alphafold-on-fire that referenced this issue Jan 27, 2022
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serialbandicoot commented Mar 15, 2022

I know this is closed, however I thought I would just add that if you're using .coveragerc then just add in the concurrency = greenlet or whichever thread option.

netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this issue Aug 24, 2022
Version 6.4.4 — 2022-08-16

- Wheels are now provided for Python 3.11.

.. _changes_6-4-3:

Version 6.4.3 — 2022-08-06

- Fix a failure when combining data files if the file names contained
  glob-like patterns (`pull 1405`_).  Thanks, Michael Krebs and Benjamin

- Fix a messaging failure when combining Windows data files on a different
  drive than the current directory. (`pull 1430`_, fixing `issue 1428`_).
  Thanks, Lorenzo Micò.

- Fix path calculations when running in the root directory, as you might do in
  a Docker container: `pull 1403`_, thanks Arthur Rio.

- Filtering in the HTML report wouldn't work when reloading the index page.
  This is now fixed (`pull 1413`_).  Thanks, Marc Legendre.

- Fix a problem with Cython code measurement (`pull 1347`_, fixing `issue
  972`_).  Thanks, Matus Valo.

.. _issue 972: nedbat/coveragepy#972
.. _pull 1347: nedbat/coveragepy#1347
.. _pull 1403: nedbat/coveragepy#1403
.. _pull 1405: nedbat/coveragepy#1405
.. _pull 1413: nedbat/coveragepy#1413
.. _issue 1428: nedbat/coveragepy#1428
.. _pull 1430: nedbat/coveragepy#1430

.. _changes_6-4-2:

Version 6.4.2 — 2022-07-12

- Updated for a small change in Python 3.11.0 beta 4: modules now start with a
  line with line number 0, which is ignored.  This line cannnot be executed, so
  coverage totals were thrown off.  This line is now ignored by,
  but this also means that truly empty modules (like ````) have no
  lines in them, rather than one phantom line.  Fixes `issue 1419`_.

- Internal debugging data added to sys.modules is now an actual module, to
  avoid confusing code that examines everything in sys.modules.  Thanks,
  Yilei Yang (`pull 1399`_).

.. _pull 1399: nedbat/coveragepy#1399
.. _issue 1419: nedbat/coveragepy#1419

.. _changes_6-4-1:

Version 6.4.1 — 2022-06-02

- Greatly improved performance on PyPy, and other environments that need the
  pure Python trace function.  Thanks, Carl Friedrich Bolz-Tereick (`pull
  1381`_ and `pull 1388`_).  Slightly improved performance when using the C
  trace function, as most environments do.  Closes `issue 1339`_.

- The conditions for using tomllib from the standard library have been made
  more precise, so that 3.11 alphas will continue to work. Closes `issue

.. _issue 1339: nedbat/coveragepy#1339
.. _pull 1381: nedbat/coveragepy#1381
.. _pull 1388: nedbat/coveragepy#1388
.. _issue 1390: nedbat/coveragepy#1390

.. _changes_64:

Version 6.4 — 2022-05-22

- A new setting, :ref:`config_run_sigterm`, controls whether a SIGTERM signal
  handler is used.  In 6.3, the signal handler was always installed, to capture
  data at unusual process ends.  Unfortunately, this introduced other problems
  (see `issue 1310`_).  Now the signal handler is only used if you opt-in by
  setting ``[run] sigterm = true``.

- Small changes to the HTML report:

  - Added links to next and previous file, and more keyboard shortcuts: ``[``
    and ``]`` for next file and previous file; ``u`` for up to the index; and
    ``?`` to open/close the help panel.  Thanks, `J. M. F. Tsang
    <pull 1364_>`_.

  - The timestamp and version are displayed at the top of the report.  Thanks,
    `Ammar Askar <pull 1354_>`_. Closes `issue 1351`_.

- A new debug option ``debug=sqldata`` adds more detail to ``debug=sql``,
  logging all the data being written to the database.

- Previously, running ``coverage report`` (or any of the reporting commands) in
  an empty directory would create a .coverage data file.  Now they do not,
  fixing `issue 1328`_.

- On Python 3.11, the ``[toml]`` extra no longer installs tomli, instead using
  tomllib from the standard library.  Thanks `Shantanu <pull 1359_>`_.

- In-memory CoverageData objects now properly update(), closing `issue 1323`_.

.. _issue 1310: nedbat/coveragepy#1310
.. _issue 1323: nedbat/coveragepy#1323
.. _issue 1328: nedbat/coveragepy#1328
.. _issue 1351: nedbat/coveragepy#1351
.. _pull 1354: nedbat/coveragepy#1354
.. _pull 1359: nedbat/coveragepy#1359
.. _pull 1364: nedbat/coveragepy#1364

.. _changes_633:

Version 6.3.3 — 2022-05-12

- Fix: now builds successfully on CPython 3.11 (3.11.0b1) again.
  Closes `issue 1367`_.  Some results for generators may have changed.

.. _issue 1367: nedbat/coveragepy#1367

.. _changes_632:

Version 6.3.2 — 2022-02-20

- Fix: adapt to pypy3.9's decorator tracing behavior.  It now traces function
  decorators like CPython 3.8: both the @-line and the def-line are traced.
  Fixes `issue 1326`_.

- Debug: added ``pybehave`` to the list of :ref:`coverage debug <cmd_debug>`
  and :ref:`cmd_run_debug` options.

- Fix: show an intelligible error message if ``--concurrency=multiprocessing``
  is used without a configuration file.  Closes `issue 1320`_.

.. _issue 1320: nedbat/coveragepy#1320
.. _issue 1326: nedbat/coveragepy#1326

.. _changes_631:

Version 6.3.1 — 2022-02-01

- Fix: deadlocks could occur when terminating processes.  Some of these
  deadlocks (described in `issue 1310`_) are now fixed.

- Fix: a signal handler was being set from multiple threads, causing an error:
  "ValueError: signal only works in main thread".  This is now fixed, closing
  `issue 1312`_.

- Fix: ``--precision`` on the command-line was being ignored while considering
  ``--fail-under``.  This is now fixed, thanks to
  `Marcelo Trylesinski <pull 1317_>`_.

- Fix: releases no longer provide 3.11.0-alpha wheels. uses CPython
  internal fields which are moving during the alpha phase. Fixes `issue 1316`_.

.. _issue 1310: nedbat/coveragepy#1310
.. _issue 1312: nedbat/coveragepy#1312
.. _issue 1316: nedbat/coveragepy#1316
.. _pull 1317: nedbat/coveragepy#1317

.. _changes_63:

Version 6.3 — 2022-01-25

- Feature: Added the ``lcov`` command to generate reports in LCOV format.
  Thanks, `Bradley Burns <pull 1289_>`_. Closes issues `587 <issue 587_>`_
  and `626 <issue 626_>`_.

- Feature: the coverage data file can now be specified on the command line with
  the ``--data-file`` option in any command that reads or writes data.  This is
  in addition to the existing ``COVERAGE_FILE`` environment variable.  Closes
  `issue 624`_. Thanks, `Nikita Bloshchanevich <pull 1304_>`_.

- Feature: coverage measurement data will now be written when a SIGTERM signal
  is received by the process.  This includes
  :meth:`Process.terminate <python:multiprocessing.Process.terminate>`,
  and other ways to terminate a process.  Currently this is only on Linux and
  Mac; Windows is not supported.  Fixes `issue 1307`_.

- Dropped support for Python 3.6, which reached end-of-life on 2021-12-23.

- Updated Python 3.11 support to 3.11.0a4, fixing `issue 1294`_.

- Fix: the coverage data file is now created in a more robust way, to avoid
  problems when multiple processes are trying to write data at once. Fixes
  issues `1303 <issue 1303_>`_ and `883 <issue 883_>`_.

- Fix: a .gitignore file will only be written into the HTML report output
  directory if the directory is empty.  This should prevent certain unfortunate
  accidents of writing the file where it is not wanted.

- Releases now have MacOS arm64 wheels for Apple Silicon, fixing `issue 1288`_.

.. _issue 587: nedbat/coveragepy#587
.. _issue 624: nedbat/coveragepy#624
.. _issue 626: nedbat/coveragepy#626
.. _issue 883: nedbat/coveragepy#883
.. _issue 1288: nedbat/coveragepy#1288
.. _issue 1294: nedbat/coveragepy#1294
.. _issue 1303: nedbat/coveragepy#1303
.. _issue 1307: nedbat/coveragepy#1307
.. _pull 1289: nedbat/coveragepy#1289
.. _pull 1304: nedbat/coveragepy#1304

.. _changes_62:

Version 6.2 — 2021-11-26

- Feature: Now the ``--concurrency`` setting can now have a list of values, so
  that threads and another lightweight threading package can be measured
  together, such as ``--concurrency=gevent,thread``.  Closes `issue 1012`_ and
  `issue 1082`_.

- Fix: A module specified as the ``source`` setting is imported during startup,
  before the user program imports it.  This could cause problems if the rest of
  the program isn't ready yet.  For example, `issue 1203`_ describes a Django
  setting that is accessed before settings have been configured.  Now the early
  import is wrapped in a try/except so errors then don't stop execution.

- Fix: A colon in a decorator expression would cause an exclusion to end too
  early, preventing the exclusion of the decorated function. This is now fixed.

- Fix: The HTML report now will not overwrite a .gitignore file that already
  exists in the HTML output directory (follow-on for `issue 1244`_).

- API: The exceptions raised by have been specialized, to provide
  finer-grained catching of exceptions by third-party code.

- API: Using ``suffix=False`` when constructing a Coverage object with
  multiprocessing wouldn't suppress the data file suffix (`issue 989`_).  This
  is now fixed.

- Debug: The ``coverage debug data`` command will now sniff out combinable data
  files, and report on all of them.

- Debug: The ``coverage debug`` command used to accept a number of topics at a
  time, and show all of them, though this was never documented.  This no longer
  works, to allow for command-line options in the future.

.. _issue 989: nedbat/coveragepy#989
.. _issue 1012: nedbat/coveragepy#1012
.. _issue 1082: nedbat/coveragepy#1082
.. _issue 1203: nedbat/coveragepy#1203

.. _changes_612:

Version 6.1.2 — 2021-11-10

- Python 3.11 is supported (tested with 3.11.0a2).  One still-open issue has to
  do with `exits through with-statements <issue 1270_>`_.

- Fix: When remapping file paths through the ``[paths]`` setting while
  combining, the ``[run] relative_files`` setting was ignored, resulting in
  absolute paths for remapped file names (`issue 1147`_).  This is now fixed.

- Fix: Complex conditionals over excluded lines could have incorrectly reported
  a missing branch (`issue 1271`_). This is now fixed.

- Fix: More exceptions are now handled when trying to parse source files for
  reporting.  Problems that used to terminate can now be handled
  with ``[report] ignore_errors``.  This helps with plugins failing to read
  files (`django_coverage_plugin issue 78`_).

- Fix: Removed another vestige of jQuery from the source tarball
  (`issue 840`_).

- Fix: Added a default value for a new-to-6.x argument of an internal class.
  This unsupported class is being used by coveralls (`issue 1273`_). Although
  I'd rather not "fix" unsupported interfaces, it's actually nicer with a
  default value.

.. _django_coverage_plugin issue 78: nedbat/django_coverage_plugin#78
.. _issue 1147: nedbat/coveragepy#1147
.. _issue 1270: nedbat/coveragepy#1270
.. _issue 1271: nedbat/coveragepy#1271
.. _issue 1273: nedbat/coveragepy#1273

.. _changes_611:

Version 6.1.1 — 2021-10-31

- Fix: The sticky header on the HTML report didn't work unless you had branch
  coverage enabled. This is now fixed: the sticky header works for everyone.
  (Do people still use coverage without branch measurement!? j/k)

- Fix: When using explicitly declared namespace packages, the "already imported
  a file that will be measured" warning would be issued (`issue 888`_).  This
  is now fixed.

.. _issue 888: nedbat/coveragepy#888

.. _changes_61:

Version 6.1 — 2021-10-30

- Deprecated: The ``annotate`` command and the ``Coverage.annotate`` function
  will be removed in a future version, unless people let me know that they are
  using it.  Instead, the ``html`` command gives better-looking (and more
  accurate) output, and the ``report -m`` command will tell you line numbers of
  missing lines.  Please get in touch if you have a reason to use ``annotate``
  over those better options:

- Feature: Coverage now sets an environment variable, ``COVERAGE_RUN`` when
  running your code with the ``coverage run`` command.  The value is not
  important, and may change in the future.  Closes `issue 553`_.

- Feature: The HTML report pages for Python source files now have a sticky
  header so the file name and controls are always visible.

- Feature: The ``xml`` and ``json`` commands now describe what they wrote

- Feature: The ``html``, ``combine``, ``xml``, and ``json`` commands all accept
  a ``-q/--quiet`` option to suppress the messages they write to stdout about
  what they are doing (`issue 1254`_).

- Feature: The ``html`` command writes a ``.gitignore`` file into the HTML
  output directory, to prevent the report from being committed to git.  If you
  want to commit it, you will need to delete that file.  Closes `issue 1244`_.

- Feature: Added support for PyPy 3.8.

- Fix: More generated code is now excluded from measurement.  Code such as
  `attrs`_ boilerplate, or doctest code, was being measured though the
  synthetic line numbers meant they were never reported.  Once Cython was
  involved though, the generated .so files were parsed as Python, raising
  syntax errors, as reported in `issue 1160`_.  This is now fixed.

- Fix: When sorting human-readable names, numeric components are sorted
  correctly: will appear after  This applies to file names,
  module names, environment variables, and test contexts.

- Performance: Branch coverage measurement is faster, though you might only
  notice on code that is executed many times, such as long-running loops.

- Build: jQuery is no longer used or vendored (`issue 840`_ and `issue 1118`_).
  Huge thanks to Nils Kattenbeck (septatrix) for the conversion to vanilla
  JavaScript in `pull request 1248`_.

.. _issue 553: nedbat/coveragepy#553
.. _issue 840: nedbat/coveragepy#840
.. _issue 1118: nedbat/coveragepy#1118
.. _issue 1160: nedbat/coveragepy#1160
.. _issue 1244: nedbat/coveragepy#1244
.. _pull request 1248: nedbat/coveragepy#1248
.. _issue 1254: nedbat/coveragepy#1254
.. _attrs:

.. _changes_602:

Version 6.0.2 — 2021-10-11

- Namespace packages being measured weren't properly handled by the new code
  that ignores third-party packages. If the namespace package was installed, it
  was ignored as a third-party package.  That problem (`issue 1231`_) is now

- Packages named as "source packages" (with ``source``, or ``source_pkgs``, or
  pytest-cov's ``--cov``) might have been only partially measured.  Their
  top-level statements could be marked as unexecuted, because they were
  imported by before measurement began (`issue 1232`_).  This is
  now fixed, but the package will be imported twice, once by, then
  again by your test suite.  This could cause problems if importing the package
  has side effects.

- The :meth:`.CoverageData.contexts_by_lineno` method was documented to return
  a dict, but was returning a defaultdict.  Now it returns a plain dict.  It
  also no longer returns negative numbered keys.

.. _issue 1231: nedbat/coveragepy#1231
.. _issue 1232: nedbat/coveragepy#1232

.. _changes_601:

Version 6.0.1 — 2021-10-06

- In 6.0, the exceptions moved from coverage.misc to
  coverage.exceptions. These exceptions are not part of the public supported
  API, CoverageException is. But a number of other third-party packages were
  importing the exceptions from coverage.misc, so they are now available from
  there again (`issue 1226`_).

- Changed an internal detail of how tomli is imported, so that tomli can use for their own test suite (`issue 1228`_).

- Defend against an obscure possibility under code obfuscation, where a
  function can have an argument called "self", but no local named "self"
  (`pull request 1210`_).  Thanks, Ben Carlsson.

.. _pull request 1210: nedbat/coveragepy#1210
.. _issue 1226: nedbat/coveragepy#1226
.. _issue 1228: nedbat/coveragepy#1228

.. _changes_60:

Version 6.0 — 2021-10-03

- The ``coverage html`` command now prints a message indicating where the HTML
  report was written.  Fixes `issue 1195`_.

- The ``coverage combine`` command now prints messages indicating each data
  file being combined.  Fixes `issue 1105`_.

- The HTML report now includes a sentence about skipped files due to
  ``skip_covered`` or ``skip_empty`` settings.  Fixes `issue 1163`_.

- Unrecognized options in the configuration file are no longer errors. They are
  now warnings, to ease the use of coverage across versions.  Fixes `issue

- Fix handling of exceptions through context managers in Python 3.10. A missing
  exception is no longer considered a missing branch from the with statement.
  Fixes `issue 1205`_.

- Fix another rarer instance of "Error binding parameter 0 - probably
  unsupported type." (`issue 1010`_).

- Creating a directory for the coverage data file now is safer against
  conflicts when two coverage runs happen simultaneously (`pull 1220`_).
  Thanks, Clément Pit-Claudel.

.. _issue 1035: nedbat/coveragepy#1035
.. _issue 1105: nedbat/coveragepy#1105
.. _issue 1163: nedbat/coveragepy#1163
.. _issue 1195: nedbat/coveragepy#1195
.. _issue 1205: nedbat/coveragepy#1205
.. _pull 1220: nedbat/coveragepy#1220

.. _changes_60b1:

Version 6.0b1 — 2021-07-18

- Dropped support for Python 2.7, PyPy 2, and Python 3.5.

- Added support for the Python 3.10 ``match/case`` syntax.

- Data collection is now thread-safe.  There may have been rare instances of
  exceptions raised in multi-threaded programs.

- Plugins (like the `Django coverage plugin`_) were generating "Already
  imported a file that will be measured" warnings about Django itself.  These
  have been fixed, closing `issue 1150`_.

- Warnings generated by are now real Python warnings.

- Using ``--fail-under=100`` with coverage near 100% could result in the
  self-contradictory message :code:`total of 100 is less than fail-under=100`.
  This bug (`issue 1168`_) is now fixed.

- The ``COVERAGE_DEBUG_FILE`` environment variable now accepts ``stdout`` and
  ``stderr`` to write to those destinations.

- TOML parsing now uses the `tomli`_ library.

- Some minor changes to usually invisible details of the HTML report:

  - Use a modern hash algorithm when fingerprinting, for high-security
    environments (`issue 1189`_).  When generating the HTML report, we save the
    hash of the data, to avoid regenerating an unchanged HTML page. We used to
    use MD5 to generate the hash, and now use SHA-3-256.  This was never a
    security concern, but security scanners would notice the MD5 algorithm and
    raise a false alarm.

  - Change how report file names are generated, to avoid leading underscores
    (`issue 1167`_), to avoid rare file name collisions (`issue 584`_), and to
    avoid file names becoming too long (`issue 580`_).

.. _Django coverage plugin:
.. _issue 580: nedbat/coveragepy#580
.. _issue 584: nedbat/coveragepy#584
.. _issue 1150: nedbat/coveragepy#1150
.. _issue 1167: nedbat/coveragepy#1167
.. _issue 1168: nedbat/coveragepy#1168
.. _issue 1189: nedbat/coveragepy#1189
.. _tomli:

.. _changes_56b1:

Version 5.6b1 — 2021-04-13

Note: 5.6 final was never released. These changes are part of 6.0.

- Third-party packages are now ignored in coverage reporting.  This solves a
  few problems:

  - Coverage will no longer report about other people's code (`issue 876`_).
    This is true even when using ``--source=.`` with a venv in the current

  - Coverage will no longer generate "Already imported a file that will be
    measured" warnings about coverage itself (`issue 905`_).

- The HTML report uses j/k to move up and down among the highlighted chunks of
  code.  They used to highlight the current chunk, but 5.0 broke that behavior.
  Now the highlighting is working again.

- The JSON report now includes ``percent_covered_display``, a string with the
  total percentage, rounded to the same number of decimal places as the other
  reports' totals.

.. _issue 876: nedbat/coveragepy#876
.. _issue 905: nedbat/coveragepy#905
itamaro added a commit to itamaro/coveragepy that referenced this issue Jan 20, 2024
itamaro added a commit to itamaro/coveragepy that referenced this issue Jan 20, 2024
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